The thermophysical properties of fullerene nanostructures

A. Markin1 and N. Smirnova1

1Nizhny Novgorod State University, Russia

Keywords: chemical thermodynamics
property: heat capacity, thermodynamic functions
material: fullerene C60 nanostructure

The thermophysical properties of fullerene nanostructures Aleksey V Markin, Natalia N Smirnova Chemistry Institute, Nizhny Novgorod State University   The discovery of the method for producing С60 fullerenes in macroquantities has laid the a new field of research. Thus, different properties of functional fullerene derivatives with valuable characteristics have been extensively investigated. In this research the thermophysical properties of fullerene C60 contain polymers, fullerides C60 with complex organometallic ligands, hydrofullerenes C60, polymeric forms with save of fullerene framework (dimers (C60)2, orthorhombic C60(O C60), tetragonal C60(T C60), rhombohedral C60(R C60)) and disorders amorphous graphite-like and diamond-like nanostructure were considered and discussed. By methods of precise adiabatic vacuum and differential scanning calorimetry the temperature dependences of the heat capacity and characteristics of the phase transition in the range from 6 to 650 K for indicated fullerene nanostructure were determined and generalized. The obtained experimental data were used to calculate the standard thermodynamic functions: heat capacity, enthalpy, entropy and Gibbs function, for temperature range between T = 0 and 600 K. The low-temperature heat capacity for objects under study was treated based on Debye theory of heat capacity of solids and their fractal model. As results, the characteristics temperatures and values of the fractal dimension D were determined. The thermodynamic characteristics of phase transitions for fullerene nanostructures under study were discussed. The thermodynamic properties of the above fullerene nanostructures were compared and discussed. In particular, most typical points in thermodynamics of fullerenes С60 and its functional derivatives were considered. The work was performed with the financial support of the grants of RF President (Project MK-2228.2011.3).

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